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1992 Toyota Corolla vaccum leak

Tiny
GEET
  • MEMBER
  • 1992 TOYOTA COROLLA
Engine Performance problem
1992 Toyota Corolla 4 cyl Front Wheel Drive Manual

hi can you tell me the role of sensor assy vacuum in obd 1 vehicle. My car idle is high. Where can it have vacuum leak? Or any solution to lower the idle.
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Monday, September 28th, 2009 AT 10:23 AM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Check all the vacuum lines for cracks.

Look at the injector seals, make sure they are seated properly.

Check the intake manifold gasket.

Car is equipped with an idle air control valve, it is mechanical, located under the throttle body. I have to say that these rarely go bad.

There is an idle adjustment screw but, DO NOT ADJUST it until you find the vacuum leak.

I just had the same problem on a 91 Corolla, turned out to be the intake manifold gasket.
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Tuesday, September 29th, 2009 AT 9:25 AM

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